Method for producing liquid-crystal polyester processed product
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Solution Overview
Problem
Liquid-crystal polyester resins exhibit poor adhesion and are difficult to dye, leading to challenges in maintaining adhesive strength and achieving colored products with high mechanical properties.
Innovation Solution
Incorporating a structural unit derived from an aromatic hydroxycarboxylic acid with an alkyl group on an aromatic ring into the liquid-crystal polyester resin, followed by an oxidation treatment such as plasma, corona, or ultraviolet irradiation, to improve wetting tension and adhesion, and allowing for the production of laminates or colored fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surface roughening is performed on metal foil to improve adhesion, then adhesive strength is improved, but transmission loss increases
Solution Approach 1:
The invention changes the chemical composition parameters of the liquid-crystal polyester resin by incorporating specific aromatic hydroxycarboxylic acid components (where Ar is a phenylene, naphthylene, or biphenylene group; R1 is an alkyl group with 1-6 carbons or cyclic alkyl group with 5-6 carbons; n is 1-4). This compositional parameter change enables the resin to achieve high adhesion to smooth metal foil surfaces without requiring physical roughening, thereby maintaining low transmission loss while improving adhesive strength
2Strength
If surface treatment is performed for too long to improve adhesion, then adhesive strength is improved, but polymer chain cleavage occurs reducing film durability
Solution Approach 1:
The invention changes the molecular structure parameters of the liquid-crystal polyester resin by incorporating aromatic hydroxycarboxylic acid components with specific structural features (Ar group variations, R1 alkyl chain lengths, and n values). These parameter changes create a resin formulation that achieves high adhesion through chemical composition rather than extensive surface treatment, thereby preventing polymer chain cleavage and maintaining film durability
3Ease of manufacture
If colorants are mixed with liquid-crystal polyester resin to achieve coloring, then colorability is improved, but resin strength is reduced
Solution Approach 1:
The invention changes the chemical composition parameters of the liquid-crystal polyester resin by incorporating aromatic hydroxycarboxylic acid components with specific structural characteristics. These parameter changes enable the resin to maintain high strength even when colorants are added, as the enhanced molecular structure provides better resistance to the strength-reducing effects of pigment incorporation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enhances the adhesion of liquid-crystal polyester resins to smooth metal foils and enables the creation of colored products with improved mechanical properties, such as high strength and heat resistance.
Implementation Method 1
performing an oxidation treatment on a surface of a liquid-crystal polyester resin formed body
Implementation Method 2
the oxidation treatment in the step is a plasma treatment
Implementation Method 3
the oxidation treatment in the step is a corona treatment
Implementation Method 4
the oxidation treatment in the step is an ultraviolet (UV) irradiation treatment
Data Source
AI summary
A method for producing a liquid-crystal polyester processed product having improved adhesion, includes a preliminary step of providing a formed body of a liquid-crystal polyester resin including a repeating unit represented by general formula (1); a step (I) of performing an oxidation treatment on a surface of the liquid-crystal polyester resin formed body; and a step (II) of stacking a resin layer on the surface on which the oxidation treatment has been performed to produce a laminate.